#!/bin/sh

echo -n "Saving configuration... "

if [ ! -f /etc/diskless ]
then
    echo "No flash setup detected."
    exit 1
fi

# Find all files newer than /etc/diskless and print them out
find_newer_files() {
  [ -d "${1}" ] || return 1
  find "${1}" -type f -not -regex '.*/tmp/*.' -newer /etc/diskless -print
}

# Archive all newer files into a gzipped cpio archive
archive_cpio() {
  [ -d "${1}" ] || return 1
  [ -f "${2}" ] && return 1
  find_newer_files "${1}" | cpio -o | gzip -9 > "${2}"
}

# Archive specified files to named target
archive() {
  archive_cpio "${1}" "${2}.cpio.gz"
}

# Mount /conf read-write, and remount if it already is.
if [ $(grep -c /conf /etc/fstab) -gt 0 ]
then
        mount -w /conf
        if [ $? -ne 1 ]
        then
                umount /conf
                mount -w /conf
		_was_mounted=true
        fi
fi

# Store config in temp staging area
mkdir -p /conf/tmp || exit 1
archive /etc /conf/tmp/etc || exit 1
archive /var /conf/tmp/var || exit 1

# Rotate current config to dated backup
# Unlimited history method: (make sure you have provisions for removing the old backups, or this can get HUGE!
dest="$(date -r "$(stat -f '%c' "/conf/default")" "+%Y-%m-%dT%H-%M-%S")"
mv /conf/default "/conf/backup/${dest}" || exit 1

# Move temp config to current
mv /conf/tmp /conf/default || mv "/conf/backup/${dest}" "/conf/default"

# Umount /conf afterwards, if it wasn't mounted
if [ -z "${_was_mounted}" -a "$(mount |grep -c "/conf")" -gt 0 ]
then
        umount /conf
fi

echo "Done!"